Tensioned projection screen

ABSTRACT

A projection screen apparatus having a perimeter frame and a substantially blank screen is provided.

RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 13/568,647, filed Aug. 7, 2012, now U.S. Pat. No. 8,462,432,which is a continuation of U.S. patent application Ser. No. 13/099,505,filed May 3, 2011, now U.S. Pat. No. 8,238,023, which is a continuationof U.S. patent application Ser. No. 11/846,279, filed Aug. 28, 2007, nowU.S. Pat. No. 7,936,505, which claims priority to U.S. ProvisionalPatent Application Ser. No. 60/840,583, filed Aug. 28, 2006, the entiredisclosures of which are expressly incorporated by reference herein.

BACKGROUND AND SUMMARY OF THE INVENTION

The present invention relates to projection screens. More particularly,the present invention relates to tensioned projection screens.

According to one exemplary embodiment of the present invention, aprojection screen apparatus is provided. The projection screen comprisesa perimeter frame including side members and a substantially blankscreen tensioned on the perimeter frame. The screen has a substantiallyflat display portion and a perimeter portion coupled to the perimeterframe. The side members include a tube portion and a track extendingfrom the tube portion. The track receives the perimeter portion therein.

According to another exemplary embodiment of the present invention, aprojection screen apparatus is provided. The apparatus comprises aperimeter frame configured to couple to a wall mount, a substantiallyblank screen tensioned on the perimeter frame, and at least one legconfigured to couple to the perimeter frame to support the apparatus ona floor.

According to another exemplary embodiment of the present invention, aprojection screen apparatus is provided. The apparatus comprises aperimeter frame including side members and corner members, the cornermember is fixedly coupled to a first side member and selectively coupledto a second side member; and a substantially blank screen tensioned onthe perimeter frame.

According to another exemplary embodiment of the present invention, aprojection screen apparatus is provided. The apparatus comprises aperimeter frame including side members and corner members and asubstantially blank screen tensioned on the perimeter frame. The screenhas a substantially flat display portion and a perimeter portion coupledto the perimeter frame. The side members includes a track. The cornermembers includes a mount. The screen apparatus further includes acoupler coupled to the screen and received by the mount of the cornermember.

According to another exemplary embodiment of the present invention, aprojection screen apparatus is provided. The apparatus comprises aperimeter frame including side member segments, each side member segmentdefining a longitudinal axis, a substantially blank screen tensioned onthe perimeter frame, the screen having a substantially flat displayportion defining a display plane, and a coupler including a firstsurface such that causing the first surface to engage abutting sidemember segments aligns the side member segments in a common planeparallel to the display plane, the coupler also including at least onesecond surface, causing the at least one second surface to engageabutting side member segments aligns the longitudinal axes of theabutting side member segments.

According to another exemplary embodiment of the present invention, aprojection screen apparatus is provided. The apparatus includes aperimeter frame including a plurality of subassemblies. A firstsubassembly includes a male end and a female end. The male end of thefirst subassembly is coupled to a female end of a second subassembly.The female end of the first subassembly is coupled to a male end of athird subassembly. A substantially blank projection screen is tensionedon the perimeter frame. A coupler is positioned to couple the screen tothe perimeter frame.

According to another exemplary embodiment of the present invention, aprojection screen apparatus is provided. The apparatus includes aperimeter frame including a plurality of subassemblies. A substantiallyblank projection screen is tensioned on the perimeter frame. Theapparatus includes a plurality of couplers. Each coupler is positionedto couple a corresponding subassembly to an adjacent subassembly. Eachcoupler includes a threaded portion and a knob portion. The threadedportion is configured to engage the adjacent subassembly.

Additional features of the present invention will become apparent tothose skilled in the art upon consideration of the following detaileddescription of an illustrated embodiment exemplifying the best mode ofcarrying out the invention as presently perceived.

BRIEF DESCRIPTION OF THE DRAWINGS

A detailed description particularly refers to the accompanying figuresin which:

FIG. 1 is a perspective view of a room showing a projector projection animage on a projection screen apparatus according to the presentdisclosure;

FIG. 2 is a perspective view of four corners of the projection screenapparatus of FIG. 1;

FIG. 3A is an exploded perspective view of portion of a frame of theprojection screen apparatus of FIG. 1;

FIGS. 3B and 3C are back and side views of the portion of the frameshown in FIG. 3A;

FIG. 4A is an exploded perspective view of portion of a frame of theprojection screen apparatus of FIG. 1;

FIGS. 4B and 4C are back and side views of the portion of the frameshown in FIG. 4A;

FIG. 5A is back view of a portion of the projection screen apparatusshowing two side frame members coupled to a corner frame member and ascreen coupled to the frame members and corner member;

FIG. 5B is a perspective view similar to FIG. 5A;

FIG. 6A is a perspective view of a left corner bracket;

FIG. 6B is a perspective view of a right corner bracket;

FIG. 7 is a perspective view of a corner frame member;

FIG. 8 is a perspective view of a portion of a side frame member;

FIG. 9 is a perspective view of a clamp provided to couple adjacentsegments of a side frame member together;

FIG. 10 is an end view of the clamp of FIG. 9;

FIG. 11 is a perspective view of a side member bracket provided tocouple adjacent segments of a side frame member together;

FIG. 12 is a perspective view of a leg support bracket provided tocouple a support leg to the frame;

FIG. 13A is a perspective view of a knob or thumbscrew provided tocouple frame members together;

FIG. 13B is a cross-sectional view of the knob of FIG. 13;

FIG. 14 is an exploded perspective view of a projection screen and fourcouplers configured to couple the screen to the frame;

FIG. 15 is a perspective view of a wall mount coupled to the perimeterframe and a wall of a structure;

FIG. 16 is a cross-sectional view taken along line 16-16 of FIG. 1showing the coupler in a first location relative to the frame member;and

FIG. 17 is a perspective view of legs and a support member for theprojection screen apparatus of FIG. 1.

DETAILED DESCRIPTION OF THE DRAWINGS

According to the present disclosure, a projection screen apparatus 10 isprovided to display images projected by a projector 12. Typically,projection screen apparatus 10 is mounted to a wall 14 of a structure,such as an entertainment room of a residence or conference room of abusiness. As shown in FIG. 1, projector 12 is positioned on the audienceside of projection screen apparatus 10 to reflect back the imagesprojected by projector 12 to an audience. According to alternativeinstallations, projector 12 is positioned for a rear projectionapplication on the back side of projection screen apparatus 10 so thatimages projected by projector 12 are displayed through projection screenapparatus 10 to the audience. In some installations, speakers (notshown) are positioned behind the projection screen apparatus 10 so thatthe sound is transmitted through projection screen apparatus 10.Additionally, projection screen apparatus 10 is provided with removablelegs 150, as shown in FIG. 17, each having a base 152 to support screenapparatus 10 on a floor, table, or other structure.

As shown in FIG. 2, projection screen apparatus 10 includes a perimeterframe 16 and a projection screen 18 tensioned on frame 16. As shown inFIG. 15, projection screen apparatus 10 further includes a plurality offlat retention rods 56 that couple projection screen 18 to frame 16 asshown in FIG. 16. Rods 56 are shown as relatively flat members but mayalso be round in cross section or may be any other shape that allowsscreen 18 to be held thereby within tracks 28 formed in frame 16. Asshown in FIG. 16, Each retention rod 56 is positioned in track 28 inframe 16.

Frame 16 includes four corner members 22 and a plurality of extendedframe members 24 extending between corner members 22 as shown in FIG. 2.Each frame member 24 is made of extruded aluminum and includes a channel26 and at least one track 28. Channel 26 is formed as a tube that islocated a position including the center of the cross section as shown inFIG. 16. Track 28 extends from channel 26 to allow for coupling withscreen 18.

Depending on the size of projection screen apparatus 10, each framemember 24 may be segmented to reduce the length of screen apparatusduring storage. Frame member 24 may include one or more segments 23.According to other embodiments, frame members 24 are not segmented.

Each corner member 22 is made of ABS plastic and includes a pair ofposts 30, 32 sized to fit within a respective recess 27 and tracks 28 ofrespective frame members 24. During assembly, posts 30, 32 are slid intorespective channels 26 and tracks 28 of each respective frame member 24to define a rectangular perimeter.

Each connecting frame piece, including frame members 24 and cornermembers 22, is coupled to abutting members 22, 24 via a respectivecorner bracket 37 or connecting side member bracket 25. Corner brackets37 are coupled to corner members 22 via screws or bolts 29. Framemembers 24 and corner members 22, in one embodiment, are provided to anend user as separate pieces ready for assembly by the end user. Eachframe member 24 includes one end that is configured to fixedly couple toa connecting side member bracket 25 or corner bracket 37 via a pair ofscrews (hereinafter referred to as the “fixed end”). Such a connectionis considered a fixed connection in that a tool, such as a screwdriveris necessary to remove the set screw to disconnect the pieces. Eachframe member 24 also includes an opposite end that is configured toselectively and removably couple to a connecting side member bracket 25or corner bracket 37 via a thumb screw 166 received in a slot 154(hereinafter referred to as the “removable end”). Such a connection isconsidered to be selectively coupled in that the connection can beundone without the use of a tool such as a screw driver, i.e. removal ofthumbscrew 166. Such a connection is readily coupled and uncoupled inthat no tools are necessary. Connecting bracket 25 and corner brackets37 include a fixed end 160 having two threaded bores for receivingscrews 29 and a removable end 162 having one threaded bore 164 thereinfor receiving a thumbscrew 166. Connecting brackets 25 and cornerbrackets 37 span between adjacent frame members 24 and corner members 22to bridge therebetween.

As shown in FIG. 16, channel 26 of each frame member 24 includes aninner surface sized and shaped to couple to connecting side memberbracket 25 or corner bracket 37. Channel 26 of fixed end of framemembers 24 receive the fixed end of connecting side member bracket 25 orcorner bracket 37 therein such that the connecting side member bracket25 or corner bracket 37 is fixed therein via screws 29 received inaligned bores in connecting/corner bracket 25, 37 and frame members 24.When so fixed, the removable end of the side member bracket 25, 37extends out of channel 26 of the frame member 24 or corner member 22.The removable end of bracket 25, 37 is then received by channel 26 of aremovable end of another frame member 24 and secured thereto via athumbscrew 166 that passes through slot 154 of the removable end and isreceived in a bore of bracket 25, 37.

When two segments 23 of a side frame member 24 are being coupled via aconnecting side member bracket 25, an exposed rear surface of channel 26receives an aluminum connector or clamp 40 thereon, see FIG. 3A. Clampor coupler 40 includes a bore to receive thumbscrew 166 therein. Whensecured to frame members 24, aluminum clamp 40 spans the seam or jointcreated by the abutting segments 23. Thumbscrew 166 passes through thebore in clamp 40, slot 154 of frame member 24, and the bore inconnecting side member bracket 25 to achieve the aligned coupling ofadjacent frame members 24. Preferably, clamp 40 is installed such thatthumbscrew 166 places frame member 24 under slight compression betweenclamp 40 and connecting side member bracket 25. Clamp 40 includes sideflanges 41. Abutting segments 23 of frame members 24 are aligned clamp40 in the direction of thumbscrew compression. Abutting segments 23 offrame members 24 are aligned in the direction that is both perpendicularto the frame member 24 and perpendicular to the compression direction bythe flanges 41. Abutting segments 23 of frame members 24 are secured inthe direction of frame members by seating thumbscrew 166 at the desiredplace in slot 154. The tension of the screen 18, as discussed in greaterdetail below, also aids in the securing of the frame members in thedirection 560 of the frame members 24.

Prior to shipment from the factory, portions of frame 16 are fixedlysecured together as subassemblies. For example, as shown in FIGS. 3A and4A, a corner member 22 is fixedly coupled to a segment 23 of side framemember 24. Additionally, a clamp 40, bracket 25, and a pair ofthumbscrews 166 are fixedly coupled to the subassembly to permitremovably coupling of adjacent segments 23 to each other or a segment 23to a corner member 22. Prior to shipment to a distributor or retailer,corner bracket 37 are fixedly secured to corner member 22 by screws 29,segment 23 is fixedly coupled to bracket 37 by screws 29, and bracket 25is fixedly secured to the opposite end of segment 23. The lower threadedend of one knob or thumbscrew 166 is threaded through a threaded hole incorner bracket 37. After the lower threaded portion is through thethreaded hole, a few of the upper threaded on the lower threaded portionare deformed so that knob 166 can not be backed out of the threaded holein bracket 37. Similarly, another knob 166 is threaded into a threadedaperture in bracket 25 and one or more threaded are deformed to preventremoval of knob 166. However, before knob 166 is coupled to bracket 25,the lower end of knob 166 is inserted through a clamp 40. Thus, afterthe threaded are deformed, both clamp 40 and knob 166 are fixedlysecured to bracket 25. A similar subassembly is shown in FIGS. 4A-4C.

Depending on the location of a subassembly around frame 16, it willinclude fewer or more components. In the exemplary embodiment, the upperleft side subassembly includes segment 23, a corner assembly (cornermember 22, corner bracket 37, and knob 166) and a clamp assembly (clamp40, bracket 25, and knob 166). The lower left side subassembly includessegment 23 with slot 154, a corner assembly, and leg mounts 180(discussed below). The lower left bottom subassembly includes segment 23with slot 154 and a clamp assembly. The lower bottom right “subassembly”includes segment 23 with two slots 154 at opposite ends. The lower rightside subassembly includes segment 23, a corner assembly, a clampassembly, and leg mounts 180. The upper right side subassembly includessegment 23 with slot 154 and a corner assembly. Upper right topsubassembly includes segment 23 with slot 154 and a clamp assembly. Theupper left top “subassembly” includes segment 23 with two slots 154 atopposite ends. According to alternative embodiments, differentcombinations of subassemblies are provided or the components are notprovided as subassemblies to the distributor or retailer.

When shipped from the factory, a total of eight subassemblies areprovided in an exemplary embodiment. The eight subassemblies are alignedwith each other and placed in an elongated package. Preferably, thelongest subassembly is about 48 inches or less. Restricting thesubassemblies to about 48 inches in length allows the projection screenapparatus 10 to be packaged for consumers such that the overall packagelength does not exceed about 48 inches. According to alternativeembodiments, subassemblies less than about 36 inches are provided.According to other alternative embodiments, subassemblies longer thanabout 48 inches are provided. Screen 18 is rolled or folded prior toshipping and placed in the package in the rolled and/or folded state.Because coupler 56 is coupled to screen 18, it is likewise rolled and/orfolded. Preferably, coupler 56 is not creased as a result of the rollingand/or folding.

When a retail customer removes the subassemblies from the package, thevarious subassemblies are assembled to create frame 16. To assemblyframe 16, the respective portions of brackets 25, 37 are slid into thecorresponding portion of channel 26. Next, each respective knob 166 isthreaded into the threaded hole of the respective bracket 25, 37. Whentightened, clamp 40 aligns respective segments 23 as discussed above.After frame 16 is assembled, screen 18 is unrolled/unfolded and coupledto frame 16.

Screen 18 may be made of a number of materials suitable for projectionscreen applications. Preferably, screen 18 has a reflectivity gain fromabout 0.4 to about 2.5. Front projections screens are preferably whiteor light gray in appearance. Rear projection screens are preferablylight gray in color and translucent to permit the projected image totransmit through the screen and be displayed to the audience. Some ofthe screens are acoustically transparent, like speaker cover fabric, topermit sound to be transmitted through the screen. Additionally, screen18 includes hook and loop material (Velcro) straps 170 attached tocorners thereof to interface with corner brackets 37.

According to one embodiment, the screen includes a woven fiberglassbacking with a vinyl reflective surface laminated to the fiberglass(gain of approximately 1.0). According to one embodiment, microscopicglass beads are provided on the viewing surface (gain from about 0.5 toabout 2.5 depending on the viewing angle). According to anotherembodiment, the screen is made of a white (gain of about 1.0 or fromabout 0.4 to about 2.2 depending on the viewing angle) or light gray(gain of about 0.6 to 0.9 depending on the viewing angle) vinyl materialwithout a backing. Other suitable projection screens known to those ofordinary skill in the art may also be provided. Preferably the screen issubstantially blank so that it is substantially free of printing orother markings that noticeably detract from the images projected on thescreen. According to one embodiment, the substantially blank screen isprovided with black borders that frame the screen for “wide screen” orother projection formats.

Before shipment to the distributor or retailer, retention rods 56 arepositioned adjacent to projection screen 18. Screen 18 is folded over asshown in FIG. 16. Retention rod 56 is then sewn to screen 18 so that thethread extends through rod 56 and into each side of screen 18 atlocation 44 as shown in FIG. 16. Four such rods 56 are sewn into screen18. As shown in FIGS. 5A and 5B, Preferably, retention rods 56 are flatstrips made of HDPE plastic.

Screen 18 with rods 56 are typically provided in the package with theframe subassemblies. To set up screen assembly 10, screen 18 is coupledto assembled frame 10 to tension screen 18 on frame 16. To initiallyposition screen 18 on frame 16, straps 170 are coupled to eachrespective corner brackets 37 to hold screen 18 in position for furtherassembly. As shown in FIGS. 6A and 6B, each bracket 37 includes mount169 includes an aperture 171 to receive a strap 170 that is looped backand secured to itself to couple a corner of screen 18 to frame 16.

With screen 18 held relative to frame 16 with straps 170, eachrespective rod 56 is positioned in track 28 as shown in FIG. 16. Toposition rod 56 in track 28, screen 18 is slightly stretched until aportion of track 28 is trapped between screen 18 and rod 56. Because rod56 is wider than track 28, it will not rotate out of track 28 and thetension provided by screen 18 pulls rod 56 inward toward the center ofscreen 18.

As mentioned above, rod 56 is shorter than screen 18 and is shorter thaneach adjacent frame member 24. The extra length of the adjacent framemember 24 provides enough room for posts 32 of corner members 22 tooccupy track 28 along with rod 56 to avoid interference therebetween.After rods 56 are positioned in respective tracks 28, hook-and-loopstraps 170 can be repositioned on mounts 169 to provide tension inscreen 18 at the corners.

After screen 18 is coupled to frame 16, frame 16 is mounted to wall 14.As shown in FIG. 14, projection screen apparatus 10 includes a pair ofwall couplers or mounts 90 that are coupled to wall 14 and frame 16 tosupport perimeter frame 16 on wall 14. Wall coupler 90 is made ofextruded plastic or aluminum and includes a first flange 92 including aplurality of fastener-receiving apertures 94 and a second flange 96.

During installation, one or more wall couplers 90 are coupled to wall 14with second flange 96 extending upwardly. Preferably, wall couplers 90are positioned at the same level so that perimeter frame 16 will belevel and then fasteners, such as screws, are inserted through apertures94 into wall 14. Second flange 96 and a flange 98 of frame member 24that defines channel 40 each have a ramped edge that facilitatesinsertion of flange 98 over second flange 96. As flange 98 of framemember 24 slides down flange 96 of wall coupler 90, frame 16 is drawncloser to wall 14. If necessary to center frame 16, frame 16 can be slidright or left on wall couplers 90 to a centered position without havingto remove frame 16 from wall 14. To remove frame 16 for adjustment ofthe tension in screen 18 or otherwise, frame 16 is raised up and removedfrom wall 14.

When coupled to frame 16, perimeter portions 110 of screen 18 overlaprespective walls 112 of frame members 24 that form a border for screen18. A substantially flat display portion 116 of screen 18 is surroundedby perimeter portions 110 and provides a display surface 118 on one sideof display portion 116 on which images projected on screen 18 byprojector 12 (either front or rear projection) are viewed by theaudience seated in front of projection screen apparatus 10. Displaysurface 118 defines a plane 120 that has a first audience side 122 andan opposite second side 124. Retention rod 56 is positioned on audienceside 122 of plane 120 and wall coupler 90 is positioned on opposite side124.

Wall 112 includes a first corner 126 on its inner edge that causesscreen 18 to turn or bend and divides screen 18 into perimeter anddisplay portions 110, 116 as shown in FIG. 16. Wall 112 also includes asecond bend 128. Corner 126 and bend 128 assist in suppressing puckeringor creasing of screen so that most, if not all, puckering or creasing isremoved from screen 18 before reaching display portion 116 so thatlittle or no distortion is caused in display surface 118.

As shown in FIG. 16, frame 16 includes a front side 140 facing theaudience and an opposite back side 142. Front side 140 is preferablypainted or otherwise colored black and includes a face 144, an outerwall 146, and an inner side wall 148. When screen 18 is coupled to frame16, display portion 116 of screen 18 defines an angle 150 to suppressimages from “washing” onto face 144. Furthermore, face 144 and innerside wall 148 have a radius therebetween that further suppresseswashing.

Similarly to the engagement of wall couplers 90 to the back of framemembers 24, support rod 250, FIG. 17, is provided with ends that engageflange 98. Support rod 250 provides support and maintains tension whenthe overall side length of frame members 24 becomes large. Support rod250 is telescopic with a spring biased member that extends throughaligned holes in the telescoping members to hold support rod 250 at anextended length. The retracted length of support rod 250 is preferablyless than or about 48 inches.

As mentioned above, in addition to wall mounting, screen apparatus 10 isprovided with telescoping legs 150. Legs 150 mount to frame members 24via leg clips 180 as shown in FIG. 3A. Leg clips 180 couple to framemembers 24 using the same bores and screws 29 that are used to coupleframe members 24 to bracket 37. Once leg clips 180 are coupled to theframe members 24, thumbscrews 166 of legs 150 threadably engage bores ofleg clips 180 to secure legs 150 thereto. Accordingly, it is possiblefor a user to take a screen apparatus 10 supported by legs 150, removelegs 150, and then mount apparatus 10 via wall couplers 90. Similarly, awall mounted apparatus 10 can be converted to a leg 150 supportedapparatus by reversing the process. Legs 150 may be provided in the samepackage to the distributor or retainer as the subassemblies of frame 16and screen 18 or may be provided in a separate package as an option forthe overall screen apparatus.

Preferably, instructions for the assembly, installation, and/or use ofprojection screen apparatus 10 are provided with projection screenapparatus 10 or otherwise communicated to permit a person or machine toassemble, install and/or use projection screen apparatus 10. Suchinstructions may include a description of any or all portions ofprojection screen apparatus 10 and/or any or all of the above-describedassembly, installation, and use of projection screen apparatus 10 orcomponents of projection screen apparatus 10. The instructions may beprovided on separate papers and/or on the packaging in which projectionscreen apparatus 10 is sold or shipped. These instructions may also beprovided over the Internet or other communication system. Furthermore,the instructions may be embodied as text, pictures, audio, video, or anyother medium or method of communicating instructions known to those ofordinary skill in the art.

Although the present invention has been described in detail withreference to preferred embodiments, variations and modifications existwithin the scope and spirit of the present invention as described anddefined in the following claims.

1. A projection screen apparatus comprising: a perimeter frame includinga plurality of subassemblies, a first subassembly including a male endand a female end, the male end of the first subassembly being coupled toa female end of a second subassembly, the female end of the firstsubassembly being coupled to a male end of a third subassembly; asubstantially blank projection screen tensioned on the perimeter frame;and a coupler positioned to couple the screen to the perimeter frame. 2.The apparatus of claim 1, wherein the second subassembly furtherincludes one of a male end and a second female end, and the thirdsubassembly further includes one of a female end and a second male end.3. The apparatus of claim 1, wherein at least one subassembly of theplurality of subassemblies includes two male ends, and at least onesubassembly of the plurality of subassemblies includes two female ends.4. The apparatus of claim 1, wherein the first subassembly includes acorner member and a side member segment fixedly coupled to the cornermember, the corner member includes the male end, and the side membersegment includes the female end.
 5. The apparatus of claim 1, whereinthe first subassembly includes a side member segment and a bracketcoupled to the side member segment, and the male end of the firstsubassembly includes the bracket.
 6. The apparatus of claim 1, whereineach subassembly is selectively coupled to an adjacent subassembly. 7.The apparatus of claim 6, further including a frame coupler including aknob configured to be engaged by hand for selectively coupling acorresponding subassembly to the adjacent subassembly.
 8. The apparatusof claim 1, wherein the male end of the first subassembly includes atleast one of a bracket and a post, and the female end of the firstsubassembly includes at least one of a channel and a track sized toreceive the at least one of the bracket and the post.
 9. The apparatusof claim 1, wherein the perimeter frame includes a front face viewableby a viewer and a back side opposite the front face, and eachsubassembly forms a portion of the front face of the perimeter frame.10. A projection screen apparatus comprising: a perimeter frameincluding a plurality of subassemblies; a substantially blank projectionscreen tensioned on the perimeter frame; and a plurality of couplers,each coupler being positioned to couple a corresponding subassembly toan adjacent subassembly, each coupler including a threaded portion and aknob portion, the threaded portion being configured to engage theadjacent subassembly.
 11. The apparatus of claim 10, wherein eachcoupler is fixedly coupled to the corresponding subassembly andremovably coupled to the adjacent subassembly.
 12. The apparatus ofclaim 11, wherein each subassembly includes a bracket for engaging theadjacent subassembly, and each coupler is fixedly coupled to the bracketof the corresponding subassembly.
 13. The apparatus of claim 10, whereineach subassembly includes a bracket and at least one of a corner memberand a side member, a first end of the bracket is fixedly coupled to theat least one of the corner member and the side member, and a second endof the bracket is removably coupled to the adjacent subassembly with thecoupler.
 14. The apparatus of claim 10, further including a legconfigured to support the perimeter frame in an upright position and aleg coupler positioned to couple the leg to the perimeter frame, the legcoupler being interchangeable with each coupler of the plurality ofcouplers.
 15. The apparatus of claim 10, wherein the perimeter frameincludes a front face viewable by a viewer and a back side opposite thefront face, and each subassembly forms a portion of the front face ofthe perimeter frame.